Update 10up/elasticpress to v5

[jerico]

Description

We are still using v4, which had its latest release in October 2023. Verify compatibility with v5 and upgrade the dependency if there are no compatibility issues.

Note: Automated and manual tests for Elasticpress don't pass currently.

Acceptance criteria

• Investigate possible breaking changes
• Implement upgrade to v5
• Changes should not be backported to previous releases.
• Update the documentation, and mention new features in Elasticpress.
• Update the upgrade guide, and mention the possible need to reindex after the upgrade.

For Altis Team Use

Ready for Work Checklist

Is this ticket ready to be worked on? See
the Play Book Definition of Ready

• Is the title clear?
• Is the description clear and detailed enough?
• Are acceptance criteria listed?
• Have any dependencies been identified? (Optional)
• Have any documentation/playbook changes been identified? (Optional)
• Is an estimate or time box assigned?
• Is a priority label assigned?
• Is this ticket added to a milestone?
• Is this ticket added to an epic? (Optional)

Completion Checklist

Is this ticket done? See
the Play Book Definition of Done

• Has the acceptance criteria been met?
• Is the documentation updated (including README)?
• Do any code/documentation changes meet project standards?
• Are automatic tests in place to verify the fix or new functionality?
  • Or are manual tests documented (at least on this ticket)?
• Are any Playbook/Handbook pages updated?
• Has a new module release (patch/minor) been created/scheduled?
• Have the appropriate backport labels been added to the PR?

[kovshenin]

For reference:

Note that starting from the ElasticPress 5.0.0 release the Users feature will be moved to the ElasticPress Labs plugin. The Terms and Comments features will remain in ElasticPress but will be available only if enabled via code. Check our blog post for more info.

[wisyhambolu]

Hey team! Please add your planning poker estimate with Zenhub @mikelittle @kovshenin